I would suggest visiting the Weschler’s http://www.weschlers.com/asp/searchresults.asp?pg=1&ps=25&st=D&sale_no=1402 or the Sloans & Keyon http://www.sloansandkenyon.com/ auction houses in town. Some of the artwork may not be to your taste (such as the portraits and landscapes), but some of the artwork that is up for auction has the clean/modern look. Every auction is different, so if you don’t find anything that you like at one auction, try another. You can get some really nice original artwork for less than $500 at these auction houses. I have placed bids on the low end (and even below) of the estimated price range on many auction items and have ended up winning the bids. I would recommend going to the auction previews.